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53 lines
2.7 KiB
JavaScript
53 lines
2.7 KiB
JavaScript
import assert from 'assert'
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import math from '../../../../src/bundleAny'
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const Unit = math.Unit
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const std = math.expression.transform.std
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describe('std', function () {
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const inputMatrix = [ // this is a 4x3x2 matrix, full test coverage
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[[10, 200], [30, 40], [50, 60]],
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[[70, 80], [90, 100], [180, 120]],
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[[130, 140], [160, 150], [170, 110]],
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[[190, 20], [210, 220], [230, 240]]
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]
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it('should return the standard deviation value along a dimension on a matrix with one based indicies', function () {
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assert.deepStrictEqual(std([
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[2, 6],
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[4, 10]], 2), [math.sqrt(8), math.sqrt(18)])
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assert.deepStrictEqual(std([
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[2, 6],
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[4, 10]], 1), [math.sqrt(2), math.sqrt(8)])
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assert.deepStrictEqual(std(inputMatrix, 1),
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[[math.sqrt(6000), math.sqrt(6000)], [math.sqrt(6225), math.sqrt(5825)], [math.sqrt(5825), math.sqrt(5825)]])
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assert.deepStrictEqual(std(inputMatrix, 2),
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[[math.sqrt(400), math.sqrt(7600)], [math.sqrt(3433.3333333333335), math.sqrt(400.0)], [math.sqrt(433.33333333333337), math.sqrt(433.33333333333337)], [math.sqrt(400.0), math.sqrt(14800)]])
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assert.deepStrictEqual(std(inputMatrix, 3),
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[[math.sqrt(18050), math.sqrt(50), math.sqrt(50)], [math.sqrt(50), math.sqrt(50), math.sqrt(1800)], [math.sqrt(50), math.sqrt(50), math.sqrt(1800)], [math.sqrt(14450), math.sqrt(50), math.sqrt(50)]])
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})
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it('should throw an error if called with an invalid one based index', function () {
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assert.throws(function () { std(inputMatrix, 0) }, /Index out of range/)
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assert.throws(function () { std(inputMatrix, 4) }, /Index out of range/)
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})
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it('should throw an error if called with invalid type of arguments', function () {
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assert.throws(function () { std(new Date(), 2) }, /Cannot calculate std, unexpected type of argument/)
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assert.throws(function () { std(new Unit(5, 'cm'), new Unit(10, 'cm')) }, /Cannot calculate std, unexpected type of argument/)
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assert.throws(function () { std(2, 3, null) }, /Cannot calculate std, unexpected type of argument/)
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assert.throws(function () { std([2, 3, null]) }, /Cannot calculate std, unexpected type of argument/)
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assert.throws(function () { std([[2, 4, 6], [1, 3, 5]], 'biased', 0) }, /Cannot convert "biased" to a number/)
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assert.throws(function () { std([[2, 4, 6], [1, 3, 5]], 1, new Date()) }, /Cannot calculate std, unexpected type of argument/)
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})
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it('should throw an error if called with an empty array', function () {
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assert.throws(function () { std([]) })
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})
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it('should LaTeX std', function () {
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const expression = math.parse('std(1,2,3)')
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assert.strictEqual(expression.toTex(), '\\mathrm{std}\\left(1,2,3\\right)')
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})
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})
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